Finding the Fourth Proportional to 10,091.39, 13,920.90 and 5,897.21

Step by Step Solution

1. Step 1: Write the proportion equation
   10,091.39 : 13,920.90 = 5,897.21 : x
2. Step 2: Convert to fraction form
   10,091.39/13,920.90 = 5,897.21/x
3. Step 3: Cross multiply
   10,091.39x = 13,920.90 × 5,897.21
4. Step 4: Simplify right side
   10,091.39x = 82,094,470.69
5. Step 5: Solve for x
   x = 82,094,470.69/10,091.39
6. Step 6: Final answer
   x = 8,135.10